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Debt and Capital Structure - Schedule of Short-Term Borrowings (Detail) - CAD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	$ 79	$ 121
Uncommitted Demand Facility
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	0	0
WRB Refining LP
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	79	121
Sunrise Oil Sands Partnership
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	$ 0	$ 0

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- Definition

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+ References

No definition available.

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- Definition

The amount of current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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